May Weather in Jefferson, United States

Last updated: June 24, 2025

In May, the average temperature in Jefferson, United States hovers around 18°C (64°F). Expect a wide range with minimums dipping to 1°C (33°F) and maximums soaring to 33°C (92°F). Prepare for notable precipitation, averaging 139 mm (5.5 in) over 14 days, accompanied by a high average humidity of 78%.

May Temperature in Jefferson

In May in Jefferson, the average temperature is 18°C (64°F). The maximum can reach 33°C (92°F), and the minimum can be as low as 1°C (33°F). Be prepared for a wide range of weather conditions when traveling to Jefferson during this time.

May Weather in Jefferson: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Jefferson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jefferson, May typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (92°F) and lows dropping to around 1°C (33°F).

Data source: Temperature data for Jefferson generated using information from the Copernicus Climate Change Service.

May Precipitation in Jefferson

In Jefferson, in May, the precipitation amount is 139 mm (5.5 in) over the course of 14 days.

May Precipitation Trends in Jefferson

The chart displays monthly precipitation patterns in Jefferson, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Jefferson, May typically receives around 139 mm (5.5 inches) of precipitation spread over approximately 14 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Jefferson

In Jefferson in May, humidity is 78%. With an average temperature of 18°C (64°F), this humidity feels like a warm, thick blanket wrapping around you, making traveling feel a bit sticky and sluggish, yet the coolness of the air tempers the intensity, inviting you to explore at a leisurely pace.

May Average Humidity in Jefferson

This chart illustrates the average monthly humidity levels in Jefferson, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Jefferson is approximately 78%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Jefferson

In Jefferson in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Jefferson.

Maximum UV Index Levels in Jefferson for May

The chart shows the monthly maximum UV Index (UVI) for Jefferson in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Jefferson typically reaches 10, which falls under the very high exposure category.

Data source: Jefferson May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How May Weather in Jefferson Compares to Other Months

Weather in Jefferson varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Jefferson, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Jefferson, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (34°F)	60 mm (2.4 inches)	84%	moderate
February Weather	3°C (38°F)	97 mm (3.8 inches)	83%	moderate
March Weather	6°C (44°F)	96 mm (3.8 inches)	83%	high
April Weather	12°C (54°F)	100 mm (4.0 inches)	81%	very high
May Weather	18°C (64°F)	139 mm (5.5 inches)	78%	very high
June Weather	22°C (73°F)	115 mm (4.5 inches)	79%	very high
July Weather	25°C (78°F)	145 mm (5.7 inches)	74%	very high
August Weather	24°C (75°F)	148 mm (5.8 inches)	72%	very high
September Weather	21°C (69°F)	123 mm (4.9 inches)	75%	very high
October Weather	15°C (60°F)	103 mm (4.1 inches)	81%	high
November Weather	7°C (45°F)	90 mm (3.6 inches)	85%	moderate
December Weather	3°C (38°F)	93 mm (3.6 inches)	84%	moderate